Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Stemphylium herbarum and S. lycopersici causing purple leaf spot of carnation in Japan.

Abstract

In late March 2016, leaf spots of carnation (Dianthus caryophyllus) cv. Konoha were detected in a greenhouse in Chiba, Japan. Leaf spot symptoms appeared as brown or purple spots with concentric rings 5-10 mm in diameter on the upper leaves. In early May 2016, disease incidence reached approximately 20% in the greenhouse. The causal pathogens were isolated and identified as Stemphylium herbarum [Pleospora herbarum] and Stemphylium lycopersici based on morphological, molecular (loci and phylogenetic analysis)and pathogenicity analyses. This is thought to be the first report of purple leaf spot caused by P. herbarum and S. lycopersici on D. caryophyllus in Japan.